GlobalISel: Legalize G_FPOWI
diff --git a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
index 4efb50c..e420e75 100644
--- a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
@@ -2170,6 +2170,15 @@
widenScalarDst(MI, WideTy, 0, TargetOpcode::G_FPTRUNC);
Observer.changedInstr(MI);
return Legalized;
+ case TargetOpcode::G_FPOWI: {
+ if (TypeIdx != 0)
+ return UnableToLegalize;
+ Observer.changingInstr(MI);
+ widenScalarSrc(MI, WideTy, 1, TargetOpcode::G_FPEXT);
+ widenScalarDst(MI, WideTy, 0, TargetOpcode::G_FPTRUNC);
+ Observer.changedInstr(MI);
+ return Legalized;
+ }
case TargetOpcode::G_INTTOPTR:
if (TypeIdx != 1)
return UnableToLegalize;
@@ -2673,6 +2682,8 @@
return lowerFPTOSI(MI);
case G_FPTRUNC:
return lowerFPTRUNC(MI, TypeIdx, Ty);
+ case G_FPOWI:
+ return lowerFPOWI(MI);
case G_SMIN:
case G_SMAX:
case G_UMIN:
@@ -4821,6 +4832,20 @@
return UnableToLegalize;
}
+// TODO: If RHS is a constant SelectionDAGBuilder expands this into a
+// multiplication tree.
+LegalizerHelper::LegalizeResult LegalizerHelper::lowerFPOWI(MachineInstr &MI) {
+ Register Dst = MI.getOperand(0).getReg();
+ Register Src0 = MI.getOperand(1).getReg();
+ Register Src1 = MI.getOperand(2).getReg();
+ LLT Ty = MRI.getType(Dst);
+
+ auto CvtSrc1 = MIRBuilder.buildSITOFP(Ty, Src1);
+ MIRBuilder.buildFPow(Dst, Src0, CvtSrc1, MI.getFlags());
+ MI.eraseFromParent();
+ return Legalized;
+}
+
static CmpInst::Predicate minMaxToCompare(unsigned Opc) {
switch (Opc) {
case TargetOpcode::G_SMIN:
